Patent US2776884A successfully refreshed from Google Patents.
US2776884A
Expired / Lapsed
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Process for the manufacture of aluminum
Assignee: Pechiney SA
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Filing: 1952-12-12
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Granted: 1957-01-08
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Expires: 1972-12-12
Abstract
No abstract record available.
Inventors
- 👤 Grunert Erhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:54
CPC Classifications
C; C22; C22B; C22B21/00; C22B21/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A PROCESS FOR REDUCING ALUMINOUS MATERIAL WITH CARBON TO ALUMINUM CARBIDE WHEREIN THE DISSOCIATION OF THE FORMED ALUMINUM CARBIDE IS ADVANTAGEOUSLY INHIBITED, COMPRISING THE STEPS OF: REDUCING THE ALUMINOUS MATERIALS WITH CARBON IN A FIRST STATE AT A TEMPERATURE OF AT LEAST 2400*K. UNDER CONDITIONS OF SUBSTANTIALLY ATMOSPHERIC PRESSURE AND THE ABSENCE OF AIR TO PRODUCE A GASEOUS PHASE MIXTURE OF AL, AL20 AND CO, AND THEREAFTER, IN A SECOND STAGE, COMPLETING THE REDUCTION OF THE AL CONTENT IN THE MIXTURE TO ALUMINUM CARBIDE BY CONTACTING THE SAID MIXTURE WITH AN ADDITIONAL AMOUNT OF CARBON AT TEMPERATURES WITHIN THE RANTE OF 1700*-2300* K. AT SUBSTANTIALLY ATMOSPHERIC PRESSURE AND IN THE ABSENCE OF AIR.
Claim 2
Dependent Claim
113 words
A PROCESS FOR REDUCING ALUMINOUS MATERIAL WITH CARBON TO ALUMINUM CARBIDE WHEREIN THE DISSOCIATION OF THE FORMED ALUMINUM CARBIDE IS ADVANTAGEOUSLY INHIBITED, COMPRISING THE STEPS OF: REDUCING THE ALUMINOUS MATERIALS WITH CARBON IN A FIRST STATE AT A TEMPERATURE OF AT LEAST 2400*K. UNDER CONDITIONS OF SUBSTANTIALLY ATMOSPHERIC PRESSURE AND THE ABSENCE OF AIR TO PRODUCE A GASEOUS PHASE MIXTURE OF AL, AL20 AND CO, AND THEREAFTER, IN A SECOND STAGE, COMPLETING THE REDUCTION OF THE AL CONTENT IN THE MIXTURE TO ALUMINUM CARBIDE BY CONTACTING THE SAID MIXTURE WITH AN ADDITIONAL AMOUNT OF CARBON AT TEMPERATURES WITHIN THE RANTE OF 1700*-2300* K. AT SUBSTANTIALLY ATMOSPHERIC PRESSURE AND IN THE ABSENCE OF AIR.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-08 | 1960-07-09 | 1961-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-08 | 1964-07-09 | 1965-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-08 | 1968-07-09 | 1969-01-08 | $7700.00 | Window Closed / Lapsed |